High Quality Content by WIKIPEDIA articles! XMLHttpRequest (XHR) is a DOM API that can be used inside a web browser scripting language, such as JavaScript, to send an HTTP or an HTTPS request directly to a web server and load the server response data directly back into the scripting language. Once the data is within the scripting language, it is available as both an XML document, if the response was valid XML markup, and as plain text. The XML data can be used to manipulate the currently active document in the browser window without the need of the client loading a new web page document. Plain text data can be evaluated within the scripting language to manipulate the document, too; in the example of JavaScript, the plain text may be formatted as JSON by the web server and evaluated within JavaScript to create an object of data for use on the current DOM.

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